Oil & Gas
| Fri 17 Jul 2026
Beijing, July 17 -- PetroChina has sought patent for System and Method for Controlling Operation Frequency of Oil Pumping Unit in Oil Field. This invention was developed by Yao Baoming, Yao Longlong, Guo Hong, Wang Jianrong, Xue Xin, Yan Minliang, Han Rong, Zhang Youyong, Wei Yuzheng, Kou Changru, Xu Juanli, Yang Wu, Li Wei, Che..